feat: add bit-width, cardinality and data-size to datablock statistics (

#2986)

The statistics here is different from arrow array statistics. 

One way to think about the concept here is that the `array statistics`
are `logical statistics` and `datablock statistics` are `physical
statistics`

It is data type agnostic and it aims to facilitate encoding selection
and to provide a centralized calculation of encoding parameter

rust/lance-datagen/src/generator.rs

@@ -373,7 +373,7 @@ where
 }
 
 #[derive(Copy, Clone, Debug)]
-pub struct Seed(u64);
+pub struct Seed(pub u64);
 pub const DEFAULT_SEED: Seed = Seed(42);
 
 impl From<u64> for Seed {

rust/lance-encoding/Cargo.toml

@@ -50,6 +50,7 @@ rand.workspace = true
 tempfile.workspace = true
 test-log.workspace = true
 criterion = { workspace = true }
+rand_xoshiro = "0.6.0"
 
 [build-dependencies]
 prost-build.workspace = true